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          <h4 id="title">Geolocation</h4>
          <div id="map" class="map"></div>
<div id="info" style="display: none;"></div>
<label for="track">
  track position
  <input id="track" type="checkbox"/>
</label>
<p>
  position accuracy : <code id="accuracy"></code>&nbsp;&nbsp;
  altitude : <code id="altitude"></code>&nbsp;&nbsp;
  altitude accuracy : <code id="altitudeAccuracy"></code>&nbsp;&nbsp;
  heading : <code id="heading"></code>&nbsp;&nbsp;
  speed : <code id="speed"></code>
</p>

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          <p id="shortdesc">Using geolocation to control a map view.</p>
          <div id="docs"><p>This example uses the Geolocation API to control the view.</p>
</div>
          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Feature.html" title="API documentation for ol.Feature">ol.Feature</a></li>,<li><a href="../apidoc/ol.Geolocation.html" title="API documentation for ol.Geolocation">ol.Geolocation</a></li>,<li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.control.html" title="API documentation for ol.control">ol.control</a></li>,<li><a href="../apidoc/ol.geom.Point.html" title="API documentation for ol.geom.Point">ol.geom.Point</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.layer.Vector.html" title="API documentation for ol.layer.Vector">ol.layer.Vector</a></li>,<li><a href="../apidoc/ol.source.OSM.html" title="API documentation for ol.source.OSM">ol.source.OSM</a></li>,<li><a href="../apidoc/ol.source.Vector.html" title="API documentation for ol.source.Vector">ol.source.Vector</a></li>,<li><a href="../apidoc/ol.style.Circle.html" title="API documentation for ol.style.Circle">ol.style.Circle</a></li>,<li><a href="../apidoc/ol.style.Fill.html" title="API documentation for ol.style.Fill">ol.style.Fill</a></li>,<li><a href="../apidoc/ol.style.Stroke.html" title="API documentation for ol.style.Stroke">ol.style.Stroke</a></li>,<li><a href="../apidoc/ol.style.Style.html" title="API documentation for ol.style.Style">ol.style.Style</a></li></ul></div>
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        <form method="POST" id="codepen-form" target="_blank" action="https://codepen.io/pen/define/">
          <textarea class="hidden" name="title">Geolocation</textarea>
          <textarea class="hidden" name="description">Using geolocation to control a map view.</textarea>
          <textarea class="hidden" name="js">var view &#x3D; new ol.View({
  center: [0, 0],
  zoom: 2
});

var map &#x3D; new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],
  target: &#x27;map&#x27;,
  controls: ol.control.defaults({
    attributionOptions: {
      collapsible: false
    }
  }),
  view: view
});

var geolocation &#x3D; new ol.Geolocation({
  projection: view.getProjection()
});

function el(id) {
  return document.getElementById(id);
}

el(&#x27;track&#x27;).addEventListener(&#x27;change&#x27;, function() {
  geolocation.setTracking(this.checked);
});

// update the HTML page when the position changes.
geolocation.on(&#x27;change&#x27;, function() {
  el(&#x27;accuracy&#x27;).innerText &#x3D; geolocation.getAccuracy() + &#x27; [m]&#x27;;
  el(&#x27;altitude&#x27;).innerText &#x3D; geolocation.getAltitude() + &#x27; [m]&#x27;;
  el(&#x27;altitudeAccuracy&#x27;).innerText &#x3D; geolocation.getAltitudeAccuracy() + &#x27; [m]&#x27;;
  el(&#x27;heading&#x27;).innerText &#x3D; geolocation.getHeading() + &#x27; [rad]&#x27;;
  el(&#x27;speed&#x27;).innerText &#x3D; geolocation.getSpeed() + &#x27; [m/s]&#x27;;
});

// handle geolocation error.
geolocation.on(&#x27;error&#x27;, function(error) {
  var info &#x3D; document.getElementById(&#x27;info&#x27;);
  info.innerHTML &#x3D; error.message;
  info.style.display &#x3D; &#x27;&#x27;;
});

var accuracyFeature &#x3D; new ol.Feature();
geolocation.on(&#x27;change:accuracyGeometry&#x27;, function() {
  accuracyFeature.setGeometry(geolocation.getAccuracyGeometry());
});

var positionFeature &#x3D; new ol.Feature();
positionFeature.setStyle(new ol.style.Style({
  image: new ol.style.Circle({
    radius: 6,
    fill: new ol.style.Fill({
      color: &#x27;#3399CC&#x27;
    }),
    stroke: new ol.style.Stroke({
      color: &#x27;#fff&#x27;,
      width: 2
    })
  })
}));

geolocation.on(&#x27;change:position&#x27;, function() {
  var coordinates &#x3D; geolocation.getPosition();
  positionFeature.setGeometry(coordinates ?
    new ol.geom.Point(coordinates) : null);
});

new ol.layer.Vector({
  map: map,
  source: new ol.source.Vector({
    features: [accuracyFeature, positionFeature]
  })
});
</textarea>
          <textarea class="hidden" name="css"></textarea>
          <textarea class="hidden" name="html">&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
&lt;div id&#x3D;&quot;info&quot; style&#x3D;&quot;display: none;&quot;&gt;&lt;/div&gt;
&lt;label for&#x3D;&quot;track&quot;&gt;
  track position
  &lt;input id&#x3D;&quot;track&quot; type&#x3D;&quot;checkbox&quot;/&gt;
&lt;/label&gt;
&lt;p&gt;
  position accuracy : &lt;code id&#x3D;&quot;accuracy&quot;&gt;&lt;/code&gt;&amp;nbsp;&amp;nbsp;
  altitude : &lt;code id&#x3D;&quot;altitude&quot;&gt;&lt;/code&gt;&amp;nbsp;&amp;nbsp;
  altitude accuracy : &lt;code id&#x3D;&quot;altitudeAccuracy&quot;&gt;&lt;/code&gt;&amp;nbsp;&amp;nbsp;
  heading : &lt;code id&#x3D;&quot;heading&quot;&gt;&lt;/code&gt;&amp;nbsp;&amp;nbsp;
  speed : &lt;code id&#x3D;&quot;speed&quot;&gt;&lt;/code&gt;
&lt;/p&gt;
</textarea>
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          <input type="hidden" name="data">
        </form>
        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;Geolocation&lt;/title&gt;
    &lt;link rel="stylesheet" href="https://openlayers.org/en/v4.6.5/css/ol.css" type="text/css"&gt;
    &lt;!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"&gt;&lt;/script&gt;
    &lt;script src="https://openlayers.org/en/v4.6.5/build/ol.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;div id&#x3D;&quot;info&quot; style&#x3D;&quot;display: none;&quot;&gt;&lt;/div&gt;
    &lt;label for&#x3D;&quot;track&quot;&gt;
      track position
      &lt;input id&#x3D;&quot;track&quot; type&#x3D;&quot;checkbox&quot;/&gt;
    &lt;/label&gt;
    &lt;p&gt;
      position accuracy : &lt;code id&#x3D;&quot;accuracy&quot;&gt;&lt;/code&gt;&amp;nbsp;&amp;nbsp;
      altitude : &lt;code id&#x3D;&quot;altitude&quot;&gt;&lt;/code&gt;&amp;nbsp;&amp;nbsp;
      altitude accuracy : &lt;code id&#x3D;&quot;altitudeAccuracy&quot;&gt;&lt;/code&gt;&amp;nbsp;&amp;nbsp;
      heading : &lt;code id&#x3D;&quot;heading&quot;&gt;&lt;/code&gt;&amp;nbsp;&amp;nbsp;
      speed : &lt;code id&#x3D;&quot;speed&quot;&gt;&lt;/code&gt;
    &lt;/p&gt;
    &lt;script&gt;
      var view &#x3D; new ol.View({
        center: [0, 0],
        zoom: 2
      });

      var map &#x3D; new ol.Map({
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          })
        ],
        target: &#x27;map&#x27;,
        controls: ol.control.defaults({
          attributionOptions: {
            collapsible: false
          }
        }),
        view: view
      });

      var geolocation &#x3D; new ol.Geolocation({
        projection: view.getProjection()
      });

      function el(id) {
        return document.getElementById(id);
      }

      el(&#x27;track&#x27;).addEventListener(&#x27;change&#x27;, function() {
        geolocation.setTracking(this.checked);
      });

      // update the HTML page when the position changes.
      geolocation.on(&#x27;change&#x27;, function() {
        el(&#x27;accuracy&#x27;).innerText &#x3D; geolocation.getAccuracy() + &#x27; [m]&#x27;;
        el(&#x27;altitude&#x27;).innerText &#x3D; geolocation.getAltitude() + &#x27; [m]&#x27;;
        el(&#x27;altitudeAccuracy&#x27;).innerText &#x3D; geolocation.getAltitudeAccuracy() + &#x27; [m]&#x27;;
        el(&#x27;heading&#x27;).innerText &#x3D; geolocation.getHeading() + &#x27; [rad]&#x27;;
        el(&#x27;speed&#x27;).innerText &#x3D; geolocation.getSpeed() + &#x27; [m/s]&#x27;;
      });

      // handle geolocation error.
      geolocation.on(&#x27;error&#x27;, function(error) {
        var info &#x3D; document.getElementById(&#x27;info&#x27;);
        info.innerHTML &#x3D; error.message;
        info.style.display &#x3D; &#x27;&#x27;;
      });

      var accuracyFeature &#x3D; new ol.Feature();
      geolocation.on(&#x27;change:accuracyGeometry&#x27;, function() {
        accuracyFeature.setGeometry(geolocation.getAccuracyGeometry());
      });

      var positionFeature &#x3D; new ol.Feature();
      positionFeature.setStyle(new ol.style.Style({
        image: new ol.style.Circle({
          radius: 6,
          fill: new ol.style.Fill({
            color: &#x27;#3399CC&#x27;
          }),
          stroke: new ol.style.Stroke({
            color: &#x27;#fff&#x27;,
            width: 2
          })
        })
      }));

      geolocation.on(&#x27;change:position&#x27;, function() {
        var coordinates &#x3D; geolocation.getPosition();
        positionFeature.setGeometry(coordinates ?
          new ol.geom.Point(coordinates) : null);
      });

      new ol.layer.Vector({
        map: map,
        source: new ol.source.Vector({
          features: [accuracyFeature, positionFeature]
        })
      });
    &lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
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